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annotate weatherlog/types.py @ 14:c01f9929ae38

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Make logger and HTTP writer more general and resilient. This makes the logger and HTTP writer more general, by removing any dependency upon the exact data type they are writing. They can now handle any type of BSON-serializable dict, and track what they have sent by keeping track of the last *byte*, not the last timestamp.
author Paul Fisher <paul@pfish.zone>
date Tue, 15 Oct 2019 22:40:24 -0400
parents 885bff085edf
children b5625b531d2d
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1 """Basic datatypes for the weather station.
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2 """
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4 import datetime
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6 import attr
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7 import pytz
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10 def _utc_now() -> datetime.datetime:
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11 """utcnow, but timezone-aware."""
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12 return datetime.datetime.now(tz=pytz.UTC)
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15 @attr.s(frozen=True, slots=True)
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16 class Reading(object):
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17 """A single reading from a temperature/humidity sensor."""
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18
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19 # The timestamp of the reading.
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20 sample_time = attr.ib(type=datetime.datetime)
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21
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22 # The temperature, in degrees Celsius.
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23 temp_c = attr.ib(type=float)
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25 # The relative humidity, in percent.
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26 rh_pct = attr.ib(type=float)
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28 @classmethod
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29 def from_now(cls, **kwargs) -> 'Reading':
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30 """Creates a new reading taken at the current time."""
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31 return cls(sample_time=_utc_now(), **kwargs)
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33 def as_dict(self):
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34 return attr.asdict(self, recurse=False)